प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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One joule of electrical energy is equal to one:
सही उत्तर: ख) watt-second
Energy = power × time, so 1 J = 1 W × 1 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The colour rendering index (CRI) of a light source measures how faithfully it shows the colours of objects. Its maximum value, as for daylight or an incandescent lamp, is:
सही उत्तर: ग) 100
CRI is graded on a scale up to 100, the value assigned to the reference source; low-pressure sodium lamps have very poor CRI.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compact fluorescent lamps (CFLs) need careful disposal mainly because they contain a small amount of:
सही उत्तर: घ) mercury
Fluorescent lamps work by a mercury-vapour discharge, so broken or discarded lamps release toxic mercury.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total solid angle subtended at a point by the whole of the surrounding space is:
सही उत्तर: क) 4π steradian
The area of a sphere is 4πr², so the full solid angle is 4πr²/r² = 4π sr.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of solid angle is the:
सही उत्तर: ग) steradian
Solid angle is measured in steradians (sr); one lumen is the flux emitted by 1 cd into 1 sr.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Before starting work on an electrical circuit, the correct safe procedure is to:
सही उत्तर: घ) isolate the supply, lock it off and test to confirm the circuit is dead
Safe isolation means disconnecting the supply, securing it against re-energising and verifying absence of voltage with a proven tester.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an MCB to disconnect an earth fault quickly, the earth fault loop impedance must be:
सही उत्तर: ख) low enough that the fault current exceeds the MCB's instantaneous trip current
Fault current = U₀/Z_s; a low loop impedance gives a large current that trips the MCB magnetically within the required time.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A practical advantage of a miniature circuit breaker (MCB) over a rewirable fuse is that the MCB:
सही उत्तर: क) can simply be reset after it trips
After clearing the fault, an MCB is switched back on, whereas a blown fuse must be rewired or replaced.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an IP rating such as IP54, the first digit indicates the degree of protection against:
सही उत्तर: ख) entry of solid objects and dust
The first digit (0–6) grades protection against solid foreign objects and dust; the second digit (0–8/9) grades protection against water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the IEC (harmonised) colour code for flexible cables, the live (phase) conductor is coloured:
सही उत्तर: ग) brown
Under the IEC code, live is brown, neutral is blue and protective earth is green/yellow.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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